/* Modern CSS Reset */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --background-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content {
  flex: 1;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.footer {
  background: var(--surface-color);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-align: center;
  padding: 1.5rem;
  margin-top: auto;
}

/* Modern Button and Link Styling */
.btn, button, input[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn-primary, button[type="submit"], input[type="submit"] {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover, button[type="submit"]:hover, input[type="submit"]:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--surface-color);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--background-color);
  border-color: var(--secondary-color);
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
  border-color: var(--danger-color);
}

.btn-danger:hover {
  background-color: #dc2626;
  border-color: #dc2626;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
}

/* Link Styling */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.link-button {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  color: var(--primary-color);
  background-color: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s ease-in-out;
}

.link-button:hover {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Modern Form Styling */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-control,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="file"],
select,
textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease-in-out;
  margin-bottom: 1rem;
}

.form-control:focus,
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.form-control:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--background-color);
  color: var(--text-secondary);
  cursor: not-allowed;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

select[multiple] {
  background-image: none;
  padding-right: 1rem;
  min-height: 8rem;
}

.form-error {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 3px rgb(239 68 68 / 0.1);
}

.form-success {
  border-color: var(--success-color);
  box-shadow: 0 0 0 3px rgb(16 185 129 / 0.1);
}

.error-message {
  color: var(--danger-color);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.success-message {
  color: var(--success-color);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

/* Modern Table Styling */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--surface-color);
  font-size: 0.875rem;
}

th {
  background-color: var(--background-color);
  color: var(--text-primary);
  font-weight: 600;
  text-align: left;
  padding: 1rem;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

th:first-child {
  border-top-left-radius: var(--radius-lg);
}

th:last-child {
  border-top-right-radius: var(--radius-lg);
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

tr:hover {
  background-color: var(--background-color);
}

tr:last-child td:first-child {
  border-bottom-left-radius: var(--radius-lg);
}

tr:last-child td:last-child {
  border-bottom-right-radius: var(--radius-lg);
}

.table-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.table-actions .link-button {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}

@media (max-width: 768px) {
  .table-container {
    font-size: 0.75rem;
  }
  
  th, td {
    padding: 0.75rem 0.5rem;
  }
  
  .table-actions {
    flex-direction: column;
    gap: 0.25rem;
  }
}

/* Modern Layout System */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.grid-cols-1 {
  grid-template-columns: 1fr;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

/* Card Components */
.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all 0.2s ease-in-out;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--background-color);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--background-color);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Legacy Support */
.two-column-container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  margin: 2rem 0;
}

.left-column,
.right-column {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.one-column-container {
  display: flex;
  justify-content: center;
  margin: 2rem 0;
}

.one-column {
  width: 100%;
  max-width: 800px;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
  .two-column-container {
    grid-template-columns: 1fr;
  }
}

/* Modern Navigation */
.navbar {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.2s ease-in-out;
  font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
  background-color: var(--primary-color);
  color: white;
}

/* Legacy Navigation Support */
.topnav {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.topnav a {
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  margin: 0 0.25rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease-in-out;
}

.topnav a:hover {
  background-color: var(--primary-color);
  color: white;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.25rem;
}

h2 {
  font-size: 1.875rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-secondary);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }